Delta baryons in neutron-star matter under strong magnetic fields
Delta baryons in neutron-star matter under strong magnetic fields
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DOI：
10.1140/epja/s10050-021-00532-6
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
V. Dexheimer;K. D. Marquez;D. Menezes
中科院分区：
文献类型：
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作者：
V. Dexheimer;K. D. Marquez;D. Menezes
在这项工作中，我们研究了磁场对包含重子八位组和附加较重自旋 3/2 重子 (the’s) 的中子星物质的影响。我们利用两种不同的相对论强子模型，其中包含介子的附加矢量-等矢量自相互作用：一种版本的相对论平均场（RMF）模型和手性平均场（CMF）模型。我们发现额外的相互作用和强磁场都增强了致密物质中的重子布居，同时降低了超子的相对密度。同时，矢量-等矢量介子相互作用对中子星质量的影响很小（），但它大大减小了中子星的半径，使两个模型与观测结果更加一致。这些特征共同表明磁中子星的内部可能含有重子。
In this work, we study magnetic field effects on neutron star matter containing the baryon octet and additional heavier spin 3/2 baryons (the’s). We make use of two different relativistic hadronic models that contain an additional vector-isovector self interaction for the mesons: one version of a relativistic mean field (RMF) model and the chiral mean field (CMF) model. We find that both the additional interaction and a strong magnetic field enhance thebaryon population in dense matter, while decreasing the relative density of hyperons. At the same time that the vector-isovector meson interaction modifies neutron-star masses very little (), it decreases their radii considerably, allowing both models to be in better agreement with observations. Together, these features indicate that magnetic neutron stars are likely to containbaryons in their interior.